Compliant but strange
The product works but can only charge pairs of batteries and fast charging is only possible for two inserted batteries. You find this out with the instructions.
It is true that it is rare to have a device with only one battery, but for example a wireless mouse.
It will go into error if the pair of batteries is too different in residual voltage.
With a little bit of effort, it eventually goes through.
Not too practical.
I see that the product is now unavailable, should I have bought the last one that was lying around?